If the 'upset' put enough g's through the airframe for the crew to have any doubts whatsoever as to its prolonged integrity, (And judging from the degree of injuries sustained this would appear to be feasible) then the correct and only decision would be to get it down pdq. Add to that (reportedly) critically injured pax with potentially major bleeds and the crew really didn't have any other choice. But injuries aside, if there is any real doubt concerning structural integrity then I believe there can only be one course of action.
I wish all injured persons as speedy a recovery as possible, and sincerely hope that reports of persons in critical condition are a typical media over-reaction.
Regards
1-11